The Golden Gate Bridge opened for business on May 27, 1937. This photo (from SF Chronicle photographer John O'Hara) shows the 50 year celebration in 1987. The photographer noted: "So many people crowded onto the Golden Gate Bridge during its 50th anniversary celebration in 1987 that its slight upward arch actually flattened under the weight. Engineers were surprised and worried. But the iconic structure is so well-built it rebounded without suffering permanent damage."
